Insert Text [■] Placement Practice Questions - TOEFL iBT

Question 1

Look at the four squares [■] that indicate where the following sentence could be added to the passage:

'This sudden influx of cold fresh water drastically disrupted the density-driven thermohaline circulation of the North Atlantic.'

Where would the sentence best fit?

'[■ A] Approximately 12,900 years ago, as the Laurentide Ice Sheet retreated, a colossal proglacial lake named Lake Agassiz breached its eastern moraine dam. [■ B] Millions of cubic meters of glacial meltwater surged through the St. Lawrence seaway into the ocean. [■ C] Without the sinking of dense, saline water, regional atmospheric heat transport collapsed, plunging Europe back into quasi-glacial conditions known as the Younger Dryas. [■ D] Over the next thousand years, cold-adapted Arctic tundra flora spread southward across the European continent.'

Accepted Answer

C) [■ C]

Answer

A) [■ A]

Answer

B) [■ B]

Answer

D) [■ D]

Question 2

Look at the four squares [■] that indicate where the following sentence could be added to the passage:

'These biological adaptations prevent ice crystals from nucleating inside living tissues.'

Where would the sentence best fit?

'[■ A] Arctic cod survive in sub-zero polar seawater that would freeze ordinary fish. [■ B] Their blood serum contains specialized antifreeze glycoproteins that bind directly to microscopic ice embryos. [■ C] By arresting the growth of nascent ice lattices, the proteins lower the freezing point of body fluids below that of the surrounding sea. [■ D] Consequently, the fish remain active in ice-strewn coastal waters throughout the polar winter.'

Accepted Answer

C) [■ C]

Answer

A) [■ A]

Answer

B) [■ B]

Answer

D) [■ D]

Question 3

Look at the four squares [■] that indicate where the following sentence could be added to the passage:

'In spite of these theoretical advantages, widespread commercial adoption faced formidable technical hurdles.'

Where would the sentence best fit?

'[■ A] Fuel cell vehicles generate electricity electrochemically from hydrogen, producing water vapor as their sole exhaust emission. [■ B] Furthermore, their energetic efficiency is more than double that of internal combustion engines. [■ C] Safe onboard storage of pressurized hydrogen at 700 bar requires expensive carbon-fiber tanks, and refueling infrastructure remains virtually non-existent in most metropolitan areas. [■ D] As a result, consumer adoption has lagged far behind battery electric vehicles.'

Accepted Answer

C) [■ C]

Answer

A) [■ A]

Answer

B) [■ B]

Answer

D) [■ D]

Question 4

Look at the four squares [■] that indicate where the following sentence could be added to the passage:

'This subterranean fungal network acts as a hidden biological conduit.'

Where would the sentence best fit?

'[■ A] Plants in a temperate forest are not isolated individuals competing purely for light and soil minerals. [■ B] Below the surface, tree roots are colonized by extensive webs of mycorrhizal mycelia. [■ C] Through these shared fungal hyphae, mature canopy trees transfer carbon and defensive chemical signals to neighboring saplings. [■ D] Foresters now recognize that preserving this interconnected underground ecology is vital for forest resilience.'

Accepted Answer

C) [■ C]

Answer

A) [■ A]

Answer

B) [■ B]

Answer

D) [■ D]

Question 5

Look at the four squares [■] that indicate where the following sentence could be added to the passage:

'Such extreme pressure differences explain why surface divers must decompress slowly.'

Where would the sentence best fit?

'[■ A] For every ten meters of ocean depth, hydrostatic pressure increases by approximately one atmosphere. [■ B] At a depth of 30 meters, a diver's lungs and bloodstream experience four times the pressure felt at sea level. [■ C] Under this elevated pressure, inert nitrogen gas dissolves into blood plasma and body tissues in accordance with Henry's Law. [■ D] Ascending too rapidly causes this dissolved nitrogen to precipitate as bubbles in joint tissues, causing decompression sickness.'

Accepted Answer

D) [■ D]

Answer

A) [■ A]

Answer

B) [■ B]

Answer

C) [■ C]

Question 6

Look at the four squares [■] that indicate where the following sentence could be added to the passage:

'To overcome this spatial limitation, ancient Mesoamerican engineers developed chinampas.'

Where would the sentence best fit?

'[■ A] The Aztec capital of Tenochtitlan was constructed on a shallow island within Lake Texcoco. [■ B] As the urban population swelled to over 200,000 inhabitants, the city faced severe arable land shortages on the mainland. [■ C] These artificial agricultural islands, built from interwoven reeds and dredged lakebed mud, yielded up to seven harvests annually. [■ D] This highly productive lacustrine farming system sustained the empire's dense urban core without exhausting regional soils.'

Accepted Answer

C) [■ C]

Answer

A) [■ A]

Answer

B) [■ B]

Answer

D) [■ D]

Question 7

Look at the four squares [■] that indicate where the following sentence could be added to the passage:

'However, this chemical resistance comes at a severe metabolic cost.'

Where would the sentence best fit?

'[■ A] In serpentine soils, high concentrations of heavy metals like nickel and chromium inhibit the growth of most terrestrial plants. [■ B] Hyperaccumulator plant species have evolved specialized transport proteins that sequester toxic nickel ions within cellular vacuoles. [■ C] Synthesizing these heavy metal chelators and maintaining vacuolar ion pumps consumes over 20% of the plant's daily photosynthetic energy. [■ D] Consequently, hyperaccumulators grow at a fraction of the speed of non-tolerant species when cultivated in normal garden soils.'

Accepted Answer

C) [■ C]

Answer

A) [■ A]

Answer

B) [■ B]

Answer

D) [■ D]

Question 8

Look at the four squares [■] that indicate where the following sentence could be added to the passage:

'In doing so, they created the earliest known architectural arch.'

Where would the sentence best fit?

'[■ A] Early Mesopotamian builders were constrained by the absence of timber and building stone in the alluvial Tigris-Euphrates plain. [■ B] They relied on sun-dried mud bricks, which possessed high compressive strength but poor tensile tolerance over horizontal openings. [■ C] By cantilevering successive courses of brick inward until they met at the apex, Sumerian masons distributed ceiling weight outward through compressive lines. [■ D] This structural innovation enabled the construction of vaulted drainage canals beneath palace complexes.'

Accepted Answer

D) [■ D]

Answer

A) [■ A]

Answer

B) [■ B]

Answer

C) [■ C]

Question 9

Look at the four squares [■] that indicate where the following sentence could be added to the passage:

'When this thermal threshold is breached, the symbiotic relationship disintegrates.'

Where would the sentence best fit?

'[■ A] Reef-building scleractinian corals depend upon photosynthetic dinoflagellates called zooxanthellae that reside within their gastrodermal cells. [■ B] Zooxanthellae provide up to 90% of the coral host's energetic budget through the translocation of photosynthesized glycerol and glucose. [■ C] However, when sea surface temperatures rise by as little as 1°C to 2°C above summer maximums, zooxanthellae photosystems produce toxic reactive oxygen species. [■ D] The coral host expels the damaged algal symbionts, exposing its white calcium carbonate skeleton in a phenomenon known as coral bleaching.'

Accepted Answer

D) [■ D]

Answer

A) [■ A]

Answer

B) [■ B]

Answer

C) [■ C]

Question 10

Look at the four squares [■] that indicate where the following sentence could be added to the passage:

'These navigational errors proved fatal to thousands of early aviators.'

Where would the sentence best fit?

'[■ A] Early cross-country flight navigation relied on dead reckoning and visual contact with landmarks like railways and highways. [■ B] When adverse weather enveloped cockpits in thick fog or nocturnal cloud cover, pilots lost visual horizon cues and suffered spatial disorientation. [■ C] Magnetic compasses were subject to turning errors and oscillation, frequently deceiving pilots into banking when they intended to level the wings. [■ D] The development of gyroscopic artificial horizons by Elmer Sperry in 1929 finally allowed pilots to fly blind through clouds safely.'

Accepted Answer

D) [■ D]

Answer

A) [■ A]

Answer

B) [■ B]

Answer

C) [■ C]

Question 11

Look at the four squares [■] that indicate where the following sentence could be added to the passage:

'Without this gravitational containment, planetary atmospheres would bleed into interplanetary space.'

Where would the sentence best fit?

'[■ A] A planet's ability to retain an atmospheric envelope depends upon the balance between thermal gas velocity and gravitational escape velocity. [■ B] Gas molecules in an atmosphere possess kinetic energy proportional to ambient temperature. [■ C] If a planet has sufficient mass, its gravitational field exerts an attraction strong enough to exceed the root-mean-square speed of atmospheric molecules. [■ D] For example, Mars has only one-tenth the mass of Earth, which is why it was unable to prevent the vast majority of its ancient atmosphere from escaping into space.'

Accepted Answer

D) [■ D]

Answer

A) [■ A]

Answer

B) [■ B]

Answer

C) [■ C]

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